Engine.



No. 727,908. PATENTEDMAY 12, 1903.

G. COLOMBO.

ENGINE.

' APPLICATION FILED JULY 20, 1901. no MODEL. 2 SHEETS-8111311132.

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WITNESSES 1 //v VE/V 7'0]? 65907- 6[70&77ZZ0 m: uo'mus PETEflS c0, PHOYGUTNQ. WASHINGTON. n c.

' the exhaust-port a of the cylinder a.

Nrrun STATES Fatenteol May 12 1903;.

ATENT FFICE.

ENGINE.

SPECIFICATION forming part of Letters Patent N 0. 727,908, dated May 12, 1903.

Application filed July 20, 1901. Serial No. 69,031. (No modelfl To all whom it may concern:

Be it known that I, GEORGE CoLoMBo, a citizen of the United States, and a resident of North Bergen, in the county of Hudson and State of New Jersey, have invented a new and Improved Engine, of which the following is a full, clear, and exact description.

This invention relates to an engine adapted particularly for use in connection with steam as a motive force, the engine being provided with a novel form of continuouslyturning valve and a cut-oif working therewith.

This specification is a specific description of one form of the invention, while the claims are definitions of the actual scope thereof.

Reference is to be had to the accompanying drawings, formingapart of this specification, in which similar characters of reference indicate correspondng parts in all the views.

Figure 1 is a longitudinal section of the invention. Fig. 2 is a side view of the cylin der with the valve removed, showing the feed and exhaust ports. Fig. 3 is anenlarged top plan View of the valve, showing its relation to the cut-off. Fig. 4 is an enlarged bottom or inner view of the cut-off, showing the valve back of it. Fig. 5 is an enlarged plan or outer side view of the valve. Fig. 6 is an enlarged bottom or inner View thereof, and Figs. 7 and 8 are diagrams showing the action of the cut-elf.

a is the cylinder, and b the piston.

a indicates the feed-ports, and a the exhaust.

c is the valve-chest, to which leads the steam -supply pipe 0. This valve-chest c communicates with the ports a and a the communication, however, being-controlled by the valve and cut-0E.

(1 indicates the valve, which, as best shown in Fig. 5, has a number (preferably three) of feed-ports d therein, these ports extending entirely through the valve. On the under or inner side of the valve exhaust-ports d are formed, which are in the nature of cavities in the under side of the valve and lead to a central cavity d which communicates with The various ports (1' and d are arranged equidistant on the face of the valve, so that the steam is properly admitted to and discharged from the cylinder. The valve 01 is carried on a hollow stem 6, revolubly mounted in the chest 0 and driven by miter-gearing from a continuously-revolving shaft 6',

findicates the cut-off, which is in disk form and which lies between the valve and cylinder. The cut off is carried on a stemf, loosely fitted in the hollow stem eand provided with a hand-lever f working with a quadrantf whereby to adjust the cut-0E as desired. The cut-0E is formed with ports therein which, according to the arrangement here shown, are in two pairsthat is to say, a larger pair f and a smaller pair f. The cut-off is provided with a central orifice f which permits the unobstructed passage of the exhaust.

The ports f of the cut-offf are of the same size and registerexactly with the feed-ports a or, in other words, are of the size of these feed-ports. The feed-ports d of the valve d and the ports f of the cut-offfare of equal sizes and of less size than the'ports a and f As the valve d revolves continuously, it places its feed-ports d in communication with the ports a, causing the steam to be admitted thereto by the coaction of the ports d exhausted from the cylinder. When the cutofi f is thrown with itsports f in registry with the feed-ports a. of the cylinder, the engine is then adjusted for the maximum steamfeed and minimum expansion, since the period of cut-off does not occur until the ports d have been moved over the entire area of the ports a. This is shown by the diagram, Fig. 7, where it will be seen that the ports a and f are much larger than the port (1 and the steam-feed continues throughout the period of registry between the ports (1 and f However, should the cut-off be thrown with its ports f in registry with the ports a there will be a relatively small steam-feed and correspondingly great expansion, because the relatively small ports-f will serve the purpose of decreasing the area of the feed-ports a and the steam will becut-off sooner than when the parts are adjusted, as indicated in Fig. 7. This relatively early cut-off decreases the steam-feed and provides a greater period of expansion. In connection with this cutoif it is pointed out that the time of admission of the steam is always constant. Let it be assumed in respect to Figs. 7 and 8 that the valve (1 is moving in the direction of the arrows shown and that the cut-offf when thrown to the position shown in Fig. 8 opens the lefthand part of the port a and closes the righthand part. Therefore the instant that the port 61 reaches the left-hand edge of the feedport a, the first admission of steam will have taken place, and it will be observed upon reference to Figs. 7 and 8 that this period of admission is constant. By means of graduations on the quadrant f or by any other means desired the exact position of the cutoil? may be readily determined, and by properly gaging the form and dimensions of the various ports the engine may be made so that the admission and expansion periods may be regulated at will.

Various changes in the form and details of my invention may be resorted to at will Without departing from the spirit of my invention. Hence I consider myself entitled to all forms of the invention as may lie within the intent of my claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination, with the cylinder havingacentrally-located exhaust and feed-ports leading from opposite sides thereof, and the valve-chest, of a rotary valve mounted in the chest and having the feed-ports extending completely through it, and recesses formed in its inner face, such recesses constituting exhaust-ports leading centrally therefrom to the engine-exhaust, and a cut-off disk adjustably mounted between the valve and cylinder, said disk having ports of difierent sizes therein, for the purpose specified.

2. The combination ofa cylinder having a feed-port, a cut-off having two ports therein, one being equal to the size of the feed-port and the other being of less size, and a valve having a port therein of a size less than the feed-port of the cylinder, and means for independently operating the cut-off and valve.

3. The combination with a cylinderhaving a centrally-located exhaust, and feed-ports leading from opposite sides thereof, and a valve-chest, of a rotary valve mounted in the chest and provided with feed-ports extending therethrough, and cavities on its under face between the feed-ports and constituting exhaust-ports, said cavities leading to a central cavity which communicates with the exhaust of the cylinder, a cut-off mounted between the valve and cylinder and having two pairs of ports therein, the pairs being of different sizes, and means for adjusting the cut-ofli, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE COLOMBO.

Witnesses:

I. B. OWENS, EVERARD B. MARsHALL. 

